Text Entry Box Question

I am creating a quiz using Text Entry boxes.  There are a few Text Entry Boxes where no text should be entered as the correct answer.  The quiz freezes in these TEBs.  I have the properties Actions tab set at “On Success  go to the next slide,” Shortcut key set to Tab, and “On Lost Focus go the next slide.” When published, it will not move off of the TEB unless there is text inserted.  Any suggestions?